Vulnerability in Mozilla Firefox
CVE-2025-11711
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Mozilla Firefox — versions 115.29, 140.4, 144
- Mozilla Thunderbird — versions 140.4, 144
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2025-81/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-82/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-83/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-84/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-85/ (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-11711?
- CVE-2025-11711 is a medium-severity vulnerability in Mozilla Firefox, classified under CWE-591. CVSS score: 6.5/10. Published 2025-10-14.
- How severe is CVE-2025-11711?
- Medium severity. CVSS v3 base score is 6.5 out of 10.